Social media can be a blessing for celebrities. It can help them reach their fans.
It can also be a curse when these same stars take sides politically, make inappropriate jokes or send photos of their private parts.
Along those lines, here are some examples of some really dumb things famous people have written on Twitter:
After Penn State fired football coach Joe Paterno because he helped cover up a child rape case, Kutcher Tweeted: "How do you fire Jo Pa? #insult #noclass as a hawkeye fan I find it in poor taste." He may not have had all the information at the time.
Amanda Bynes has plenty of issues. But she thinks Drake is ugly?!? "@drake please don't think you're good looking!" she once wrote. "Ew!...I'll post ugly pics of @Drake every time I see one! Not hard ;)...Ugly far apart eyes."
Alec Baldwin has a temper problem. That was never more evident than when he went on a homophobic rant against The Daily Mail writer George Stark, Tweeting: "I'm gonna find you, George Stark, you toxic little queen, and I'm gonna fuck… you… up. I'd put my foot up your fucking ass, George Stark, but I'm sure you'd dig it too much."
Lohan removed the N-Word reference in this Tweet not long after she posted it (following a Kanye West concert). But nothing ever disappears from the Internet!
Bethenny Frankel was likely referencing her ex-husband, Jason Hoppy, when making this joke. Not that it makes it okay.
Remember when that airplane vanished? CNN sure does! And Jason Biggs used it as a chance to make a joke, Tweeting: "Anyone wanna buy my Malaysian Airlines frequent flier miles?"